Nanocomposites and nanomaterials

Spectral characteristics of plasmonic copper monosulfide nanoparticles 
Yaremchuk I.1, Vernyhor O.1, Bulavinets T.1, Lesyuk R.1,2,3
1Department of Photonics, Lviv Polytechnic National University,
S. Bandery str. 12, Lviv, 71013, Ukraine. 
E-mail: iryna.y.yaremchuk@lpnu.ua
2Pidstryhach Institute for Applied Problems of Mechanics and Mathematics,
Naukova Str.3-b, Lviv, 79060, Ukraine 
3Institute of Physics, University of Rostock, 
Albert-Einstein-Straße 23 – 24,18059 Rostock, Germany

In this work, the influence of the structural parameters of CuS on its dielectric constant has been established. It is shown that the wavelength and plasma frequency have influence on the value of the complex dielectric constant of CuS nanoparticles. The spectral characteristics of CuS nanoparticles are calculated depending on their structural and geometric parameters. The frequency of localized surface plasmon resonance of CuS nanoparticles is directly proportional to their plasma frequency and decreases with an increase in the dielectric constant of the surrounding medium and with an increase in the damping constant of free carriers. In addition, the value of the extinction coefficient decreases with a decrease in the plasma frequency. The change in the value of the plasma frequency significantly affects the position of the localized surface plasmon resonance peak. The calculation results showed that the extinction coefficient of CuS nanoparticles decreases with an increase in the damping constant of free carriers. However, it should be noted that the position of the localized surface plasmon resonance peak in this case will not change and will be at a wavelength of about 1 μm. An increase in the refractive index of the surrounding medium leads to a shift in the plasmon absorption peak to the longer wavelengths. It was found that the plasma frequency and refractive index of the medium in which the nanoparticles are located have the highest influence on the value of the extinction coefficient of CuS nanoparticles.

Financial support of Ministry of Education and Science of Ukraine should be acknowledged (DB/Interface, DB/MEV)